I beg to differ! I just stood by a dyno and saw a 352 CI Y-Block make 500, 502, 504 HP on 3 consecutive runs with 10.1:1 compression. Helped change 3 sets of heads, 3 intakes, 7 spacers, etc.(Yes, one set was mine, and my intake that made the 500+) It was a great day, and I will shut up about the rest. I don't want to steal anyone's thunder. Joe-JDC.